11 12 729 Checking Cylinder Head For Leaks (N73)

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NOTE:

For Special Tool identification, see ENGINE- SPECIAL TOOLS .

Special Tools Required:

11 9 430
11 9 432

Necessary Preliminary Tasks:

Remove left cylinder head. Refer to 11 12 105 REMOVING AND INSTALLING LEFT CYLINDER HEAD (N73) .
Remove right cylinder head. Refer to 11 12 106 REMOVING AND INSTALLING RIGHT CYLINDER HEAD (N73) .
Remove left bearing bracket with inlet camshaft and intermediate shaft. Refer to 11 37 012 REMOVING AND INSTALLING/REPLACING LEFT INTERMEDIATE LEVERS (N73) .
Remove right bearing bracket with inlet camshaft and intermediate shaft. Refer to 11 37 014 REMOVING AND INSTALLING/REPLACING RIGHT INTERMEDIATE LEVERS (N73) .
Remove left exhaust camshaft. Refer to 11 31 036 REMOVING AND INSTALLING/REPLACING LEFT EXHAUST CAMSHAFT (N73) .
Remove right exhaust camshaft. Refer to 11 31 038 REMOVING AND INSTALLING/REPLACING RIGHT EXHAUST CAMSHAFT (N73) .
Remove all valves. Refer to 11 34 560 REPLACING ALL VALVE STEM SEALS (N73) .

Place special tool 11 9 430 on cylinder head sealing faces.

To secure special tool 11 9 430, secure with the old cylinder head bolts and the supplied nuts.

Fig 1: Installing Special Tool On Cylinder Head Sealing Faces

Courtesy of BMW OF NORTH AMERICA, INC.

Remove vent fitting on cylinder head.

Screw in special tool 11 9 432.

Connect pressure hose to pressure gauge.

Test pressure: 4.5 bar.

Immerse cylinder head in a water bath.

Check cylinder head for escaping air (cracks).

NOTE: If the necessary, add cleaning agent to water bath.

Fig 2: Installing Special Tool (11 9 432)

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Replace cylinder head in event of cracking in water or oil area.

Assemble engine in reverse sequence to its disassembly.